SH-ARC PCI
Manual
Version 01.00
3.3 COM2002x Configuration
The COM2002x controller[1] has to be initialized in the following way:
3.3.1
Setup Register
Bit Description
Bit No.
Value
Comment
Slow Arbitration
Bit
0
0 for Bit rate <=
2.5 MBit/s
1 for Bit rate >= 5
MBit/s
Pulse1 Mode
1
1
Push-pull driver
activated in backplane
mode
3.3.2
Access Mode
The COM2002x is operated in non-multiplexed mode. After a reset,
shifting to this mode is effected by controller unit accesses [1]
which have to be performed by the software. If this initialization
is not performed, the COM2002x will not function properly.
In case of using the SoHard NT Driver or DOS Enabler, the
initialization is automatically performed.
3.4 LED Indicators
LED, PC Activity (red):
This LED indicates all I/O accesses to the SH-ARC PCI adapter by the
host PC. Every access is prolonged with the aid of a digital one-shot
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